Improving sodium ion batteries with mechanically robust nanocellular graphene

Improving sodium ion batteries with mechanically robust nanocellular graphene
Schematic illustration for the formation NCG during liquid metal dealloying of amorphous manganese-carbon (Mn-C) alloy in a molten bismuth (Bi) to induce selective dissolution of manganese (Mn) atoms and self-organization of carbon (C) atoms into graphene layers. Credit: Advanced Materials (2024). DOI: 10.1002/adma.202311792

Ever since its discovery in 2004, graphene has been revolutionizing the field of materials science and beyond. Graphene comprises two-dimensional sheets of carbon atoms, bonded into a thin hexagonal shape with a thickness of one atom layer. This gives it remarkable physical and chemical properties.

googletag.cmd.push(function() { googletag.display(‘div-gpt-ad-1449240174198-2’); });

Despite its thinness, graphene is incredibly strong, lightweight, flexible, and transparent. It also exhibits extraordinary electrical and thermal conductivity, high surface area, and impermeability to gases. From high-speed transistors to biosensors, it boasts an unrivaled versatility in applications.

Nanocellular graphene (NCG) is a specialized form of graphene that achieves a large specific surface area by stacking multiple layers of graphene and controlling its internal structure with a nanoscale cellular morphology.

NCG is coveted for its potential to improve the performance of electronic devices, energy devices and sensors. But its development has been stymied by defects that occur during the manufacturing process. Cracks often appear when forming NCG, and scientists are looking for new processing technologies that can fabricate homogeneous, crack-free and seamless NCGs at appropriate scales.

“We discovered that carbon atoms rapidly self-assemble into crack-free NCG during liquid metal dealloying of an amorphous Mn-C precursor in a molten bismuth,” says Won-Young Park, a graduate student at Tohoku University.

The findings are published in the journal Advanced Materials.

Dealloying is a processing technique that exploits the varying miscibility of alloy components in a molten metal bath. This process selectively corrodes certain components of the alloy while preserving others.

Park and his colleagues demonstrated that NCGs developed by this method exhibited high tensile strength and high conductivity after graphitization. Moreover, they put the material to the test in a sodium-ion battery (SIB).

“We used the developed NCG as an active material and current collector in a SIB, where it demonstrated a high rate, long life and excellent deformation resistance. Ultimately, our method of making crack-free NCG will make it possible to raise the performance and flexibility of SIBs—an alternative technology to lithium-ion batteries for certain applications, particularly in large-scale energy storage and stationary power systems where cost, safety, and sustainability considerations are paramount.”

More information:
Wong‐Young Park et al, Mechanically Robust Self‐Organized Crack‐Free Nanocellular Graphene with Outstanding Electrochemical Properties in Sodium Ion Battery, Advanced Materials (2024). DOI: 10.1002/adma.202311792

Journal information:Advanced Materials

Provided by
Tohoku University

READ MORE

How and When Did Saturn Get Those Magnificent Rings?

NASA’s Cassini spacecraft captures three of Saturn’s moons—Tethys, Enceladus and Mimas—in this group photo. NASA/JPL-Caltech/Space [...]

Scientists invent coin-sized device to rapidly isolate blood plasma for diagnostics and precision medicine

Prototype of the ExoArc system, which allows for a one-step automated isolation of high-quality blood [...]

These Sea Creatures Have a Secret Superpower: Invisibility Cloaks

A midwater creature has few ways to hide from predators. A new report says some [...]

Development of source technology for the use of wearable devices without recharging

Schematic of a partially filled TEM Credit: Korea Institute of Science and Technology (KIST) Despite [...]

How does potassium affect my blood pressure?

Eating foods rich in potassium may help protect you from high blood pressure. If you [...]

3D internal structure of rechargeable batteries revealed for the first time

Graphite crystal model sample and SEI formation on the edge section vs basal plane. a [...]

Extremely rare marsupial mole that ‘expertly navigates’ sand dunes spotted in Western Australia

Kanyirninpa Jukurrpa Martu rangers have photographed an elusive mole covered in silky golden locks that [...]

Kudzu: Love It — or Run

Over the past century, kudzu (rhymes with “mud zoo”) has become a mythic feature of [...]